To start this off, I like Sonic Heroes. It a fun adventure game with very fun platforming sections. Though I must say the voice acting is
REALLY BAD. Well, since Team Sonic is the team they wanted for a walkthrough. I shall go Team Sonic.
Team Sonic Intro:
You're treated to a cutscene with Sonic running free in the canyon. (though that's not where you really start lol) Till you meet Tails and Knuckles in the Tornado. You get a letter from Eggman saying "Dear Sonic Heroes, Guess what, Sonic Heroes? I've finally developed the ultimate weapon! In three days I'll conquer the world! Think you can stop me?" And that's where the game begins.